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I think you broke it. The piston I mean. It would take alot of detonation to crack a piston on a n/a engine. But I assume that the T next to the 3.1 in your post means turbo. With a turbo running even 10psi of boost it is alot easier to crack a piston. Id guess that the factory boost settings are set around 7 - 8 psi though to be safe. In the event that the vacuum hose blows off of the wastegate can you will get whats called overboost. Too much boost for the engine to handle safely. Which means you are also likely to get detonation. My guess is that the top of the piston decided to fly off.
Pull the head and check it out.
Did that oil have a storng gas odor?
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